Guitar strap fastener



FIG. 1 is a perspective view showing our new design for a guitar strap fastener;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof, the opposite side being a mirror image;

FIG. 5 is a top side view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 2. 

CLAIM The ornamental design for a guitar strap fastener, as shown and described. 